White points can be defined using one of multiple methods in all of the nodes of the Colour Look and Feel. The following methods are available:
Select a white point using a standard illuminant. Currently supports most standard CIE illuminants, see 2.4 for
further detail.
Select a white point using a color value.
Select a white point using a tristimulus value xy. This can be used to specify non-standard illuminants.
The selected white point is handled independently of the node color space.